Scottman1925

I am trying to access a VB6.0 DLL with Visual Basic 2005. The VB6 DLL has run for years so I know it works. Below is my VB2005 code. I am getting the following error when I call my RegisterHost function:

"Type mismatch. (Exception from HRESULT: 0x80020005 (DISP_E_TYPEMISMATCH))"

I am new to Visual Basic 2005 so any help would be greatly appreciated.


Form Load

InitializePlugins()
oPlugin.RegisterHost(Me) - This is where the error happens.


Module Module1
Public oPlugin As Object
Public Sub InitializePlugins()
Try
oPlugin = CreateObject("Agilent34401A.HIOSplugin")
Catch
MessageBox.Show(Err.Description)
End Try
End Sub
End Module



Function in VB 6.0 DLL I am calling:

Public Sub RegisterHost(CallingForm As Object)
On Error GoTo err
Dim MainForm As Object
Set MainForm = CallingForm
Call MainForm.RegisterPlugin(MyName)
err:
End Sub

AtmaWeapon

A .NET 2.0 Windows Form is not a VB6 form; if the DLL is expecting to receive an object of type VB6 form I am afraid you are limited to using VB6 to work with it.

I could be wrong though.

Eduardo Lorenzo

you might want to register the VB6 dll using RegAsm or RegSvr32 and change your .Net reference to the registered version.

AtmaWeapon

That won't change the fact that the dll is expecting a VB6 Form object and will get a Windows Forms 2.0 object instead. They are different and incompatible, I'm afraid.

There might be some crazy way to marshal a .NET Form as a VB6 Form but I have a feeling it would involve a lot of hassle and not really be worth it. I recognize the name Agilent, and I'm quite certain they have a .NET equivalent to whatever VB6 library is being used here.

If they don't then my company is in better shape than I thought I went to go check their website but (and I don't know if I am glad or not) their web site seems as useless as mine for obtaining anything important.

Eduardo Lorenzo

my bad. I didn't read the entire post.
Please accept my apologies Scottman1925. I did not intend to traumatize your first visit.

Welcome to the forums!